These should help, it isn't rust. I havent cleaned mine up yet (too lazy and it doesn't bother me enough). I didn't read through the threads, but if they arn't helpful, use the search function and type in "cosmic rust"

rust already god this makes me think about what is the fate of the diecast g1 toys...

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It's not rust, that's just the common term being used for the Tarnishing on MP Meg's feet.

The problem here is the diecast metal is untreated where on most other figures, the diecast is painted to match the figure or otherwise. The use of a metal polish will 'cure' the "cosmic rust"/tarnishing quite simply.

Those threads linked to in the earlier post will probably be able to recommend a clear top coat that can be used which would seal the metal and prevent the tarnishing from happening again.

I think when i get my MP megs from the reissue coming up first thing i may do is clear coat his toes to prevent the tarnishing. Is that a good idea?

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I don't want to tell anyone what they should do, but I plan on getting a second one when they do come out and I will be putting something on the feet and spine. Maybe the gun mode will hide a lot of ruined area's on my existing figure?